Kalama -- a 3d printer is a great idea!
themadpatter -- try this video for ideas:
https://www.youtube.com/watch?v=_mZXvijwj8E How to Reproduce a missing molding or part on furniture (using silicone). Once you create the mold and then the reproduction, you can use your casted item to carve your wood out if you're good at woodworking. At least that's how I'm thinking it may be done if you really want wood.
The comments section on this video are helpful, too.